Writes the character of charCode
.
This method is equivalent to write(new String.fromCharCode(charCode))
.
This operation is non-blocking. See flush or done for how to get any errors generated by this call.
void writeCharCode(int charCode) { _sink.writeCharCode(charCode); }
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https://api.dart.dev/stable/2.5.0/dart-io/Stdout/writeCharCode.html